What was found
FOR FLIGHT 2710 THE CREW REPORTED THAT WITH APU RUNNING BLEED OPEN PACK NR 2 MADE NON-REGULAR RUNNING SOUNDS AFTER CYCLING PACK NR 2 AND ODORLESS SMOKE/VAPOR WAS SEEN AROUND THE AIRCRAFT AND FILLED UP THE CABIN. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE E1 BLEED VALVE IAW EMB 145 AMM 36-11-05, OPC GOOD, MEL 36-01 RESTORED. PART NUMBER 3215886-2, S/N 354. REMOVED AND REPLACED RIGHT ACM IAW EMB 145 AMM 21-51-03 OPS CHECK GOOD, NO LEAKS NOTED AND ETN EM 21-056. PART NUMBER 8152403, S/N 9908264. REMOVED AND REPLACED RIGHT DUCT TEMP SENSOR IAW EMB 145 AMM 21-60-03, OPS CHECK GOOD. PART NUMBER 8152892, S/N 06455. THE AIRCRAFT WAS RETURNED TO SERVICE.